Improvement in mill-spindle bushes and trams



2 Sheets-Sheet 1. E. G. CUSHING. Mill-Spindle Bushes and Trams.

No. 200,436. Pfltented Feb. 19, 1878.

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Wl T/vEsSEs. /N VEN TOR.- Mw Am M/y N.PETERS, FHOT0-L|THOGRAPHER,WASHINGTON. o CA '2 Sheets-Sheet 2.

B. GXGUSHING.

Mill-Spindle Bushes and Trams. No. 200,436. Patented Feb. 19,1878.v

www Y* MPEYERS. PHOTCLLITNUGRAPNER. WASHINGTON D C frummsnms PATENT"OFFICE.

ELBRIDGE e. oUsHiNcr,` or oswEGo, New vonk, AssieNon or ONE-HALF rusRIGHT To HILAND H. fxnivnnicx, or sAME PLAGE.'

IMPROVEMENT- IN'MILL-sjPlNnLl-:BusHi-:s AND TRAMS.V

Specification forming' partof Letters Patent No. 200,436', datedFebruary'lQ, 1878 g application filed June 27,1877.

- Bushes, of which the following, taken in connection with theaccompanying drawings, is a M full, clear, and exactdescription. 4 Thepurpose ofv this invention is to render the bed-stone perfectlyself-adjusting `to the yface of the runner when vinmotion; and also hasfor its object to adjust the spindle in its relativecentral position inthe bed-stone by devices which shall be effective and reliable in theiroperation, and convenient of access formanipulation from underneath thebed-stone aswell as above the same.

yThe invention consists principally, f1rst,'in the combination andarrangement, with the bed-stone, of a concavo-convex bearing, analogousin principle to a ball-and-socket joint, and a series of peculiarlyconstructed and arranged anti-friction rollers interposed between therespective bearing-surfaces, by means of which the bed-stone is affordeda sensitive universal vibratory movement, respondent to that of therunner when in operation, and thus renders the former perfectlyself-adjusting to the face of the latter.

The second part of my invention consists in the combination andarrangement, with the followers or bushing surrounding the spindle, ofset-screws passing horizontally through the hub, and provided on theouter end with a cylindrical head, having in its periphery oblique orspiral grooves, and auxiliary set-screws arranged vertically at rightangles to the setscrews proper, engaging the cylindrical head of same,and having its ends extended respectively above and below the bed-stone,all constructed, combined, and arranged substantially in the mannerhereinafter fully described.

The invention is clearly illustrated in the accompanying drawings,wherein- Figure l is a plan view with the bed-stone removed; Fig. 2, avertical section on line x x of Fig. l, Fig. 2%, an exterior view of thehub through which the spindle passes, showing more fully the arrangementof the set-screws for adjusting the bush of the spindle, also a `topVview of theplate constituting a part of the device for securing theauxiliary set-screw in' its' position; Fig. 3, a plan view of the underside of the bearing attached tothe bottom of the bed-stone, andFigA anenlarged transverse section of the friction-roller upon which Vthebed-stone is mounted'.

Y Similar letters of reference indicate corresponding parts. v

- A is the bed-plate, properly secured to the husk-frameand provided inits center with a hub, h, through; which thev spindlesI passes. From thebase of the hub radiate a series 'of bearings, b, in the form ofsections of a balljoint or of a sphere described from a point in thecenter of the spindle some distance below the bed-plate. In aslot vinthe center of the said bearing is a roller, r, pivoted on a pin or axle,which passes through the bearing b at such relative depth as to cause aportion of the periphery of the roller i' to project above thebearing-surface. Y

'Io the under side of the bed-stone is rigidly secured a plate, B,provided in its center with a concave bearing, a., in the form of anannular section of a hemisphere of somewhat greater radius than andconcentric with the spherical lower bearing b. The bed-stone rides withits concave bearing a on the friction-rollers r 1 in the lower bearingb.

The runner, although intended to be kept in perfect balance, will, whenin motion, vibrate more or less in various directions, and causeinequality in the bearings between the respective grinding-surfaces; andsince the runner frequently attains a very high speed of revolution,accompanied with a correspondingly accelerated 'vibratory movement, itis essential that the seat of the bed-stone should be suficientlysensitive to allow the bed-stone to readily yield to the vibrations oroscillations of the runner. In order to attain this result, I providethe axle c in its periphery with a circumferential centrally-inclineddepression, d, and the roller r with an enlarged centrallycontractedeye, c, of such a bevel as to cause the roller to rest on the centralinterior ridge, and allow it to rock freely without bringing the outeredges of the eye in contact with the pin. The inclination of thedepression d in the axleretains `v`the rollery in ,its central axialposition.

The second part of my invention has reference to devices connected withthe bush of the spindle for the purpose of adjusting the same in itsrelative central position in the bed-stone.

'l l represent thebusliing'or followers, ttedE in vertical recesses inthehub JL. rujis Aa :setscrew, working horizontally through the shell ofthe hub, and engaging with its inner end the rear of' the bush.Itsoutcnend is ,prod

vided with a cylindrical head, t, having longitudinal grooves or threadsin its periphery.

u' isxan auxiliary set-screw, arranged veerti-l cally on the exterior ofthe hub h, and at the,

side of the head o of the set-screw proper, and engaging the same byscrewthreads on its periphery. ,One end` of the auxiliaryset-screw isextended through the bed-plate A, andprovided underneath the Lsame ,witha suitable headfor manipulation. The upperend passes throogh aslot, f,in a flange, yrloieoeing from the exterior of thehub It abovethesetfscrew proper, and is retained ftherein by Valplate, g',

' attached to the iiange g by a bolt, i, Iand hav- 1- le.` oombieetioewith elle .beeriggsoaeed .b,jthe p in` c,having thebeveled'circumtferfen- Atial depression d, tand the' roller r,"having`the eye e, beveled in a relatively greater angle from each side to forma circumferential ridge in the center, constructed substantially asdescribed and shown, forjthepurpose set forth.

2. In combinationlwith a, spindle-bush, the set-screw u, havingcyllndrical head fv, with longitudinal grooves or threads in itsperiphery, and the auxiliaryset- Screwu',f arranged vertically by theside of the head c of the setscrew proper, and provided thereat withextcrllal screw-threads, substantially in the manner and for the purposeset forth.

3. The combination and arrangement, with the spindle-bush, of theset-screw u, having on its outer end the cylindricalvhearlo,withlongtedieal grooves `in its (periphery, and elle auxiliarysessel-"ew .at arranged VVertieally by the side. ofthe heed e oftheseersorew proper, and provided with vesteeeal soreW-ehreeds thereatand having ooe. eed exteefledthoegh Vthe bedt-Iilate A, and1 itsopposite end'through a projection onthe exterior of .thel hub, 'above.the set-screw proper, substantiallyzas and for the j purpose s peciied.

,4. ,.In combination t with Vthe yset-screw u', the' -liangeg'onhubhhavingV slotfrand the plate g, nattached to said liange jby, bolt i, andhav- 4ing .a slot transverse. tothat of therange, substaetially as endfor thererrose seeforth- 111 testimony `whereof I `have `jbereueto seemy hand in the presence of two attestin g witmesses at Oswego, N- 3?-,this 30th day .of Mey,

.-ELBRIDGEG. Geselle VWitnesses W- e-.Roemsom EB. LE. WELns.

